package com.test.list.imageLoading;

/** Copyright (C) 2009 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 **/
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Map.Entry;
import android.graphics.Bitmap;
import android.util.Log;

public class MemoryCache
{

	private static final String TAG = "MemoryCache";
	private Map<String, Bitmap> cache = Collections
			.synchronizedMap(new LinkedHashMap<String, Bitmap>(10, 1.5f, true));// Last
																				// argument
																				// true
																				// for
																				// LRU
																				// ordering
	private long size = 0;// current allocated size
	private long limit = 1000000;// max memory in bytes

	public MemoryCache()
	{
		// use 25% of available heap size
		setLimit(Runtime.getRuntime().maxMemory() / 4);
	}

	public void setLimit(long new_limit)
	{
		limit = new_limit;
		Log.i(TAG, "MemoryCache will use up to " + limit / 1024. / 1024. + "MB");
	}

	public Bitmap get(String id)
	{
		if (!cache.containsKey(id))
			return null;
		return cache.get(id);
	}

	public void put(String id, Bitmap bitmap)
	{
		try
		{
			if (cache.containsKey(id))
				size -= getSizeInBytes(cache.get(id));
			cache.put(id, bitmap);
			size += getSizeInBytes(bitmap);
			checkSize();
		} catch (Throwable th)
		{
			th.printStackTrace();
		}
	}

	private void checkSize()
	{
		Log.i(TAG, "cache size=" + size + " length=" + cache.size());
		if (size > limit)
		{
			Iterator<Entry<String, Bitmap>> iter = cache.entrySet().iterator();// least
																				// recently
																				// accessed
																				// item
																				// will
																				// be
																				// the
																				// first
																				// one
																				// iterated
			while (iter.hasNext())
			{
				Entry<String, Bitmap> entry = iter.next();
				size -= getSizeInBytes(entry.getValue());
				iter.remove();
				if (size <= limit)
					break;
			}
			Log.i(TAG, "Clean cache. New size " + cache.size());
		}
	}

	public void clear()
	{
		cache.clear();
	}

	long getSizeInBytes(Bitmap bitmap)
	{
		if (bitmap == null)
			return 0;
		return bitmap.getRowBytes() * bitmap.getHeight();
	}
}